I support Universal Basic Income (I think the USA can afford it), but it appears the studies of Seattle's $15 minimum wage are not a slam dunk win for UBI. Lots of thoughtful discussion in this podcast:
Lots of the discussion is about selection bias -- nearly everyone uses these academic studies to confirm however they already feel about UBI.
Note: I'm aware UBI and minimum wage hikes can be two separate (though related) discussions.
And arguments are made that UBI would eliminate the (apparently real) downsides of minimum wage fiddling.
That's also part of the podcast -- that "the left" wants UBI and all this minimum wage stuff is just prelude to the true agenda.
People are complicated. Their motivations and good faith understandings vary wildly. Let alone all the bad faith actors in the "debate."